From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 15 Nov 2012 11:35:41 +0000 (+0000)
Subject: Btrfs: disable qgroup id 0
X-Git-Tag: v3.8-rc5~1^2~10^2~11
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=d86e56cf7d3669dd292012ac82b986bd1573b6cc;p=linux-block.git

Btrfs: disable qgroup id 0

Qgroup id 0 is a special number, we should set the id of a qgroup to 0.
Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 7624212ae926..dd8e3448fe8f 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3698,6 +3698,11 @@ static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
 		goto drop_write;
 	}
 
+	if (!sa->qgroupid) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	trans = btrfs_join_transaction(root);
 	if (IS_ERR(trans)) {
 		ret = PTR_ERR(trans);